Extracted text: A 50 cm x 70 cm rectangylar ring beam curved in plan is supported on 8 columns located equidistant on a circle of 9 m mean diameter as shown in Fig. 12.8. If the service load intensity is 100 kN/m and diameter of columns is 35 cm, design the beam at a support. Take ock 20 N/mm? and o, = 415 N/mm?. %3D A -500 A 700 4500 ENLARGED SECTION AT A-A Fig. 12.8 Ring beam in plan